I haven't read the entire thread so pardon if this has already been posted.

I don't know if this is still the case, but my older boxes of CCI Velocitor ammo, are marketed as Gold Dot bullets with expansion suitable for varmits. Here is a ballistic gelatin test of the Velocitor's that shows expansion.
Velocitor Ballistic Gel Test

And here is the main page of the site with all of their 22lr gelatin tests.
.22LR Ballistic Gelatin Tests